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Table 1 4 Groundwater Monitoring Data 1995 to Present ARCO Service Station No 2130 7906 North EI Dorado Street, Stockton, California Well Elevation Stattc Walei Groundwater Ethyl- Total Number Date `I op of Casing I op of Sc icon Level Elevation I PIIG Benzene Toluene benzene Xylene MTBE Observations MW-3 02/28/95 1610 6000 55 88 -3978 73 0 7 <0 5 <0 5 <0 5 NA No FP,No S MW-3 05/19/95 16 10 5394 -37 84 52*** <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 08/28/95 16 10 5564 -3954 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 12/07/95 16 10 5430 -3820 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 02/05/96 16 10 51 73 -3563 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 05/30/96 16 10 48 79 -3269 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 09/18/96 16 10 5273 -36 63 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 11/26/96 1610 5041 -3431 <50 1 9 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 03/24/97 16 10 4529 -29 19 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 05/20/97 16 10 45 93 -2983 <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 08/19/97 16 10 4956 -3346 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 11/19/97 16 10 4762 -31 52 <50 1 3 1 1 <0 5 083 <5 No FP,No S MW-3 03/04/98 1610 4295 -2685 <50 <0 5 <0 5 <0 5 <0 5 <5 No 1'P,No S MW-3 06/26/98 1610 4067 -2457 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 09/01/98 1610 4250 -2640 71 6 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 12/02/98 16 10 3975 -23 65 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 03/31/99 16 10 36 17 -2007 <50 054 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 06/04/99 16 10 3756 -2146 102 0 569 <0 5 4 45 0 885 <5 No I-P,No S MW-3 09/02/99 16 10 42 16 -2606 <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 11/29/99 1610 4024 -24 14 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S MW-3 03/16/00 16 10 3621 -2011 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S MW-3 06/26/00 16 10 38 89 -2279 <50 <0 5 <0 5 <0 5 <0 5 <2[2] No FP,No S C lARM2130\Q I RLY12 r 3an20o As Delta Page 3 of 10 9/19100